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The Mokolumne River, which originates in the high Sierra, provides more than 90 percent of the East Bay's water and the Owens Valley in the eastern Sierra serves as a key source of water for Los Angeles. rejected by an appellate court and the California Supreme Court With modest additional investments San Francisco will be able to maintain an uninterrupted supply of high quality Tuolumne River water. The dam and reservoir are the source for the Hetch Hetchy Aqueduct, which provides water for over . If you look at this chart for Hetch Hetchy, you can see that the biggest and steadiest rise is between March and July, https://waterdata.usgs.gov/monitoring-location/11275500/#parameterCode=00054&period=P365D&compare=true. lawsuit, saying Restore Hetch Hetchys arguments were preempted resizeframe(); Water is such a fascinating topic and Id hate to have to be a water manager making a decision on how much to release to avoid reservoir flooding. Fish and Wildlife Service that provides an immediate $4 million investment for habitat improvements for fisheries in the Tuolumne River. } If you look at the inflow data on the major reservoirs, its pretty flat. Privacy Policy | 2011-2021 San Francisco Public Utilities Commission. The reservoir was at 75 percent capacity as of May 5, totaling 269,963 acre-feet of water (an acre-foot is nearly 326,000 gallons). Ive looked at reservoir sights for years. Can a rock climber help 'restore' Yosemite's Hetch Hetchy Valley? At the beginning of this water year, which started on October 1, 2022, the state's largest water reservoir, Lake Shasta, was a third full, at 33 percent. While constructed and owned by San Francisco, the water system was in fact planned to benefit the greater San Francisco Bay Area population. The water system, which includes the landmark Hetch Hetchy Reservoir, is expected to fill this winter, for the first time since 2019, with nearly 1.5 million acre-feet of water. The BAWSCA agencies are therefore key stakeholders in ensuring the system serves as a reliable source of high quality water. It seems likely one of those two readings is wrong. A small portion of the citys water comes from local reservoirs. A different story is unfolding at Hetch Hetchy reservoir in Yosemite National Park, where water is being released to conserve and restore wildlife. Your email address will not be published. Exclusive: Stunning photos show Yosemite National Park under 15 feet of Warriors treating Andrew Wiggins with understandable patience, but his California snowpack hits highest level this century for March, could Map shows which parts of California exceeded entire years worth of rain, Map shows stunning improvement in California drought, Last chance to see: Bay Bridge lights turn off on Sunday. Due to its high-altitude location at 3,900 feet above sea level best to drain the valley. No it is correct. required on whether to demolish OShaughnessy Dam. "In contrast, the Shasta Lake drainage had only a couple of stations in excess of 10 inches whereas most received less. https://cdec.water.ca.gov/dynamicapp/QueryDaily?s=HTH For example, the average storage level for Feb. 7 is usually 65% of capacity for Trinity Dam, but currently its at 31%. Spring snowmelt runs down the Tuolumne River and fills Hetch Hetchy, the largest reservoir in our water system. Construction of the regional water system proceeded over the following 20 years, with water first delivered in 1934. They also built a spillway that was too steep and did not install energy dissipators along the spillway. River. Awesome work!! The average for this time of year is approximately 4,659.57ft, plus or minus 39ft. Nice! Last week, I paid a visit to Hetch Hetchy. Local reservoir inflows have negative daily flow rates set to zero. It could be the 180% of historical average of snowpack, which will be melting in a couple months. The blue line indicates the reservoirs water level one year ago today. Weve been at zero now for several weeks, and we really want to see that turn around., Kellie Hwang and Yoohyun Jung are San Francisco Chronicle staff writers. I wonder why it doesnt work for you. The recent spate of storms lifted the statewide snowpack to 190% of average for the start of the month, and more snow is on the way. It allowed the water over the spillway to move too fast creating a vacuum between the water and the concrete that pulled the concrete sections out of the spillway. Visualization was done in javascript and specifically the D3.js visualization library. Begin at O'Shaughnessy Dam. This dashboard is great! The main reason for the discrepancy, the department said, is that the focus of the atmospheric river was generally between the Golden Gate and Mount Lassen, meaning that the Feather River watershed received much more rainfall than the Shasta Lake drainage area. Although Hetch Hetchy Reservoir is the most well-known, it stores less than 25% of the systems water. Nate, thanks for the insight. Call 209-372-0200 for the latest road and weather conditions, Hetch Hetchy Road Daily Hours: 8 am to 5 pm Also a little nit. This is wonderful information. Thats just another very strong indication visually that its a big water year.. Thanks for the prompt reply! Ive been meaning to search for aquifer levels. I find myself coming back to this every few days to check on our water . Partly because of low water, the rivers chinook salmon runs have plummeted from tens of thousands of fish annually a few decades ago to fewer than 1,000 in recent years. Long-term values for reservoir inflows use maximum number of complete water years in record. over the past few days. globe = document.getElementById('mekko'); Add a button to convert the row heights to log scale. 2013, photo, the Hetch Hetchy Reservoir is hazy with smoke . In 2021, the SFPUC and the Modesto and Turlock Irrigation Districts launched a proactive pilot program with the U.S. Great work. Monitoring location 11277500 is associated with a LAKE, RESERVOIR, IMPOUNDMENT in TUOLUMNE COUNTY, CALIFORNIA. The valley is use must be reasonable.. Best of luck out there in California! The water transmission system in the Bay Area and Peninsula includes the Bay Division, San Andreas, Sunset Supply, and Crystal Springs pipelines. Meanwhile, the group Restore Hetch Hetchy is urging the SFPUC to abandon Hetch Hetchy Reservoir. Hetch Hetchy water travels 160 miles via gravity from Yosemite to the San Francisco Bay Area. More about the Tuolumne River Voluntary Agreement can be found athttp://www.tuolumnerivermanagementplan.com. I havent spent much time looking at it but that data is on the CDEC website. That puts it at 84 percent of where it would usually be usually at this time of year. Especially for small ones it is hard to identify them and click on them. Is it because the laws have changed on how much each reservoir can hold or is it in anticipation of significantly more rain? Generation at the Kirkwood power plant would depend on the natural flow of the Tuolumne River, and would be significantly diminished during late summer and fall. Hetch Hetchy today | Restore Hetch Hetchy Hetch Hetchy Reservoir in Yosemite was 69 percent full on Tuesday, 150 percent of normal for this time of year. Updated to include drought zones while tracking water shortage status of your area, plus reservoir levels and a list of restrictions for the Bay Areas largest water districts. provides water to 2.7 million residents and businesses in the San If you are experiencing a water, power, or sewer emergency or service problem call our 24-hour hotline at 3-1-1 or (415) 701-2311 from outside SF or log on at, Public Notices and Public Meeting Notices, Customer Assistance Program - Water/Wastewater, Customer Assistance Program - Hetch Hetchy Power, Hetch Hetchy Power Medical Necessity Assitance Program, Hot Water Recirculation Pump Rebate Program, San Francisco's Urban Watersheds Overview, Free Phone Consultations, Evaluations and Devices, Games Puzzles Virtual Backgrounds Overview, Get your Free 2023 Pollution Prevention Calendar, Construction & Contracts Overview Overview, Contract Opportunities and Payments Overview, Project Review and Land Use - Hetch Hetchy Water and Power, Project Review and Land Use - San Francisco, Sewer System Improvement Program Overview, Water Infrastructure Improvements Overview, Boards, Commissions and Committees Overview, Internships, Apprenticeships and Youth Employment, Public Notices and Public Meeting Notices Overview, Audited Financial Statements & Annual Comprehensive Financial Reports, SFPUC Preliminary Public Power Options Report, Civic Center Sustainable Utilities District Plan, Resolution Condemning Systemic Racism & Taking Action to Promote Racial Justice. Santa Clara, Alameda and San Mateo counties. Check out my **new combined California reservoir and snowpack visualizer** to compare to historical values, as well asthe California precipitation tracker and California snowpack visualizer. Its water supply Hetch Hetchy Reservoir, in the Sierra Nevada is 80% full, the ground is saturated and near-record rainfall has occurred in recent days. Your tools are awesome just hurts when you receive bad data at times! . a broad meaning that had been previously applied in an Excellent graphic! A truly excellent project. The overall storage is said to have dropped by 57.4 to 56.4 (or 302 kaf). You dont see runoff right away, the snow is still up there, frozen, doing what we want it to do, he said. Great visualization Chris! As of 5pm on 1/18, the data appears correct (~58k acre feet), but an hour ago it was reading off the chart (3X above what they are allowed to store right now). HETCH HETCHY RES A HETCH HETCHY CA - USGS Water Data for the Nation The area around Shasta has more volcanic soils that absorb rainfall than the Feather River drainage. Its currently listed on this page as 29kaf full, but the usgs.gov page below says Hetch Hetchy is at 299.7kaf full. Sierra Club unsuccessfully fought the reservoirs establishment So on Jan 10 were at 82% of the average for Jan 10. located in a national park and it passed the Raker Act in 1913 to "This was rare for October. So its volume is counted as Orville inflow. Stay up-to-date with breaking news and upcoming events. I know this might be difficult to display but Im very curious on the actual amounts of water consumed on a monthly basis and if this is somehow processed in a certain between what is agricultural and what is non-commercial etc? This other page: https . Twenty of San Some want the city to leave more water in stream channels for threatened salmon while others continue a longshot bid to shut down Hetch Hetchy Reservoir in Yosemite altogether and return the area to its natural state. Eighty-five percent of the water comes from Sierra Nevada snowmelt stored in the Hetch Hetchy reservoir situated on the Tuolumne River in Yosemite National Park. "Soils that have become hydrophobic due to wildfire can also contribute to increased runoff because the water is less able to penetrate the burned soil," the department said. A question: the Historical Avg*, is it the value of year-today or natural year? Born in Seoul, Yoohyun began her career in Arizona, where she worked for two of the state's largest newspapers covering various beats, including criminal justice and education. But tearing down O'Shaughnessy Dam in order to restore Hetch Hetchy Valley would be a disaster. A .gov website belongs to an official government organization in the This November, a group of environmental advocates will put forth a ballot measure that would require the San Francisco Public Utilities Commission to develop a plan to drain Hetch Hetchy.